综合物探技术在某浅埋煤矿采空区的应用

Application of comprehensive geophysical prospecting technology in the goaf of certain shallow coal mine

煤矿采空区因其隐蔽性和复杂性,对铁路安全运行有重要影响。为查明武荆铁路某隧道范围内采空区分布情况,采用高密度电法结合多源频率域地震法对采空区进行综合地球物理探测。应用结果表明,两种方法均能有效探测出采空异常区。高密度电法显示高阻异常,多源频率域地震法显示低速异常,与前期地球物理特征分析相一致,充分说明前期地质调查的必要性。钻探成果进一步表明,两种物探方法异常范围均偏大,且高密度电法纵向分辨率相对较高,多源频率域地震法横向分辨率相对较高。两者结合,一方面从两种物性参数进行相互佐证,另一方面使物探异常范围进一步缩小,有利于提高物探精度。本物探方法的组合模式可为条件相似的浅层采空区探测提供有意义的借鉴。

Coal mine goaf has an important impact on the safe operation of railways because of its concealment and complexity.In order to find out the distribution of the coal mine goaf within a tunnel of the Wujing Railway,the high density resistivity method combined with the multisource frequency domain seismic wave method are used to conduct the comprehensive geophysical exploration.The application results show that both methods can effectively detect the mined-out anomaly.The high density resistivity method shows the high-resistance anomalies,and the multisource frequency domain seismic wave method shows the low-speed anomalies,which are consistent with the previous geophysical characteristic analysis,and fully demonstrate the necessity of the previous geological survey.The drilling results further show that the abnormal ranges from the two geophysical prospecting methods are relatively large.The high density resistivity method has relatively high vertical resolution,and the multisource frequency domain seismic wave method has relatively high horizontal resolution.The combination of the two methods,on the one hand,provides the mutual corroboration for the two physical parameters,on the other hand,further reduces the range of geophysical anomalies,which is beneficial to improve the accuracy of geophysical prospecting.The combined mode said above can provide a meaningful reference for the detection of shallow coal mine goaf with similar conditions.